I've never yet accepted an AI written answer when responding to my emails all though I try it routinely. Mostly it just doesn't capture my style. But even when it does, there's some kind of essential spark missing.

I think a lot about the concept that the AI output is still 99% regression to a mean of some kind. In that sense, the part it can generate for you is all the boring stuff - what doesn't add value. And to be sure, if you're writing an email etc, a huge amount of that is boring filler, most of the time. But the part it specifically cannot do is the only part that matters - the original, creative part.

The filler was never important anyway. Physically typing text was never the barrier. It's finding time and space to have the creative thought necessary to put into the communication that is the challenge. And the AI really doesn't help at all with that.